IT IS not the purpose of this paper to present a comprehensive report on osteoma of the frontal sinuses, as most of the facts now known about this condition can readily be found in such excellent recent articles as those of Teed1 and Dowling.2 We also direct attention to the article by Handousa3 because of its many clearcut illustrations, roentgenograms and succinct case reports. The article by Cushing,4 although dealing primarily with orbitoethmoidal osteomas and their complications, had considerable influence on the subsequent surgical approach to osteomas of the frontal sinuses with intracranial complications. Conley's5 paper is of interest because it was the first to call attention to the repair of cranial defects by tantalum implants following surgical removal of osteomas of the frontal sinus. An estimation of the relative frequency of osteoma of the frontal sinus might be deduced from the number of cases